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By A. Y. Huc

This quantity covers marine, lacustrine, and terrigenous resource rocks in quite a few areas, stratigraphic frameworks, and paleo-environments. it's cross-disciplinary, up to date, complete, and profusely illustrated.American organization Of Petroleum Engineers (AAPG)Founded in 1917, we're the world's biggest specialist geological society, with over 30,000 members.We are a pillar of the world-wide medical group. Our books foster clinical learn, enhance the technological know-how of geology and advertise the best use of petroleum extraction & processing expertise and practice.Some of the parts we submit in include:GISPetroleum EngineeringWell Log AnalysisGeological ModelingCarbonate PetrologySeismic ImagingReservoir CharacterizationRegional Petroleum research

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Extra info for Paleogeography, Paleoclimate & Source Rocks (AAPGStudies in Geology) (Aapg Studies in Geology)

Sample text

Estuaries and shallow coastal productivity, resulting mostly from nutrient input from land, are not shown. brought to the sea by rivers is eaten or decomposed, and the remainder is buried in the sediments accumulating along the continental margins. As a result of the postglacial rise in sea level, most river-borne detritus accumulates in estuaries or deltas, but this is an ephemeral situation and the suspended loads of rivers may have been more evenly distributed over larger areas of the continental shelves in the past.

Primary (phytoplankton) productivity in the sea depends on two factors: light and a supply of nutrients. Light is limited by the declination of the sun and by the turbidity of the water. The supply of nutrients depends on whether nutrients are already present in the water, or whether they must be introduced from land or by upwelling nutrient-rich deeper waters. Paleoceanography of Marine Organic-Carbon–Rich Sediments Light Where the sun angle is high, light adequate for photosynthesis penetrates oligotrophic (sterile) ocean waters to a depth of about 100 m, as shown in Figure 9.

The temporal and spatial scales of the C org accumulations in these modern anoxic basins are very different from those of petroleum source rocks. The Baltic Sea (Magaard and Reinheimer, 1974) is a large positive freshwater balance sea with a shallow connection to the North Sea. It is mostly very shallow (mean depth 55 m), but has some depressions, such as the Gotland, Fårö, and Landsort Deeps, that extend to 200 m below the mean depth and contain anoxic waters (Grasshoff, 1974, 1976). Although at present the Mediterranean has a strong negative freshwater balance (Tchernia, 1980), it has been suggested that at the times of sapropel formation in the Quaternary it had, at least regionally, a positive freshwater balance due to increased inflow from the Nile (Rossignol-Strick, 1985, 1987) and from increased precipitation in the eastern Mediterranean borderlands (Rohling and Hilgen, 1991).

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